Geodesic
Systems of the form $\{\varphi_k(n_k{x})\}$ equivalent to systems of independent functions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 1 
V. F. Gaposhkin. Systems of the form $\{\varphi_k(n_k{x})\}$ equivalent to systems of independent functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 1. http://geodesic.mathdoc.fr/item/RM_1967_22_1_a19/
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     title = {Systems of the form $\{\varphi_k(n_k{x})\}$ equivalent to systems of independent functions},
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     number = {1},
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     url = {http://geodesic.mathdoc.fr/item/RM_1967_22_1_a19/}
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[1] M. Kac, “Convergence of certain gap series”, Ann. of Math., 44 (1943), 411–415 | DOI | MR | Zbl

[2] V. F. Gaposhkin, “Lakunarnye ryady i nezavisimye funktsii”, UMN, 21:6 (1966), 3–82 | Zbl